mt90528ag2 Zarlink Semiconductor, mt90528ag2 Datasheet - Page 38

• Manufacturer Part Number: mt90528ag2
• Description: 28-port Primary Rate Circuit Emulation Aal1 Sar
• Manufacturer: Zarlink Semiconductor

4.2
The external memory interface module of the MT90528 provides access to external memory devices by various
MT90528 modules (i.e., TDM, TX_SAR, UTOPIA, SDT RX_SAR, Data RX_SAR) and by the CPU.
The MT90528 can interface with both the pipelined and flow-through types of synchronous zero bus turnaround
(ZBT) RAM. The difference between flow-through and pipelined memories is illustrated in Figure 8 and Figure 9. In
the case of flow-through memory, read cycle data is available on the next rising clock edge after the address is
sampled by the memory. Contrarily, the data from pipelined memory is available two rising clock edges after the
Service Enable
Data RX_SAR
Data RX_SAR Sta-
Bits (2020h,
tus Bits (2022h,
bits<4:1>)
External Memory Interface
bits<4:1>)
AND
AND
AND
Figure 7 - Sample Interrupt Generation (for Data RX_SAR Module)
AND
OR
Interrupt Enable
(000Ah, bit<6>)
(0002h, bit<6>)
Register
Main Status
Register
1
Zarlink Semiconductor Inc.
1
MT90528
AND
38
AND
AND
AND
AND
AND
AND
AND
AND
NOR
Data Sheet
IRQ